Add support for building android apps

Add support for running aapt to generate R.java and Manifest.java,
compiling java into jar, adding resources to the jar to convert it
into an apk, signing the apk, and zipaligning the apk.

Change-Id: I7a73fef590d07f35b3d0b56a8571780c09bb10ae

root.bp

@@ -5,8 +5,7 @@ subdirs = [
     "bionic",
     "dalvik",
     "external/*",
-    "frameworks/base/libs/*",
-    "frameworks/base/tools/*",
+    "frameworks/base",
     "frameworks/native/libs/*",
     "hardware/*",
     "libcore",
@@ -14,4 +13,6 @@ subdirs = [
     "prebuilts/ndk",
     "prebuilts/sdk",
     "system/core/*",
+    "packages/apps/HTMLViewer",
+    "build/tools/*",
 ]